Iodset - Brocade Communications Systems 8 Command Reference Manual

Fabric os command reference manual supporting fabric

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iodSet

Enables in-order delivery (IOD).

iodset --help

Use this command to enforce in-order delivery of frames during a fabric topology change.

In a stable fabric, frames are always delivered in order, even when the traffic between switches is

shared among multiple paths. However, when topology changes occur in the fabric (for instance, a

link goes down), traffic is rerouted around the failure and some frames might be delivered out of

order. This command ensures that frames are not delivered out-of-order, even during fabric

topology changes. It enforces a sufficient delay between the event that causes an existing path to

be removed and the establishment of a new path, so that frames are delivered in order. However,

this also means that frames are dropped during the delay, causing I/O failures.

When used without operands, iodSet enables in-order-delivery of frames on a switch (legacy IOD

behavior). Frame loss is unavoidable when a port goes down.

IOD is disabled by default. Use iodShow to display current settings. Use iodReSet to restore the

default setting.

You can no longer use this command to manage lossless DLS. Use dlsSet instead. The following

command options are deprecated in Fabric OS v6.4.0 and later:

The execution of this command is subject to Virtual Fabric or Admin Domain restrictions that may

be in place. Refer to chapter 1, "Using Fabric OS commands" and Appendix A, "Command

Availability" for details.

This command has the following operands:

To display the default legacy IOD setting:

To enable IOD: